In my opinion, I think that's The exchange of something at any time may be capable of knowledge and some things do not necessarily always exchange might mean, that can generate benefits.
In my opinion, Think of the loop Exchange something all the time. May be able to know things, and some things do not need to trade up. Probably means that can be useful.
In my opinion, thought to mean the exchange something all the time. May be can knowledge objects, and something need to exchange always. Probably means giving can be created advantage.